I realize that 1º on a t-stat is fine. I have tested an un-named on/off t-stat that the probe was reading 3ºF high and then the shut off point was yet another 5º so when set for 92 it delivered an average of 95º but the spike was 100 and it hit that spike every 10 min of so. Accurate to 1 degree is fine, I feel it is very important to figure the 'swing' into things set to 91 the expected range of 90-92 is reasonable. Probe accuracy is paramount, and understanding that it is potentially off alters the way the T-Stat can be safely used.

I calibrate processors as part of my work, I have very good thermometers (thermocouple) I know exactly how crummy the cheap digital ones are. I have about 16 now and little notes on them about how far away from correct they are when the hit 4º I toss them. I understand that a resistive sensor is about the only way to go that is salable. I mean a $3000 4 probe thermometer is not going to be sell. My OCD can tolerate 1º +/- but the typical 2º makes me crazy. One of the ones I got (I will remember to check the specs before buying) is 2ºC +/- I have never used it at all.

I have been working on a battery back up system. There is a silly by-law about running gas motors outside for longer than 30 min a day. That means no generators and not wanting to rock the reptile boat in my area I adhere to that. The cost of an independent heating T-stat and pure seine wave inverter not to mention battery rack is prohibitive. A modified seine wave inverter as you well know drops the cost dramatically. I have looked at on off units as well but my first one I tested made me uneasy. I would expect the Honda to be fine, they I believe, use a pure seine wave inverter. The rest... I expect are modified and we know how much variation you can see there.

Thanks for your answers, that helps. I hope you find time to complete the specs soon and complete the web site as well. I was quite skeptical in my first initial glance of your product. Without hard information I am unwilling to trust the welfare of my animals (I care about them a great deal) to anything. T-stats to my mind a critical safety component and also quite likely the most prone to issues. Personally I think you have a great unit and I hope your thermometer system is ready soon. I currently am using a herpstat pro as a thermometer system but really would like a web reporting but as an Apple computer guy the software Dion has just won't work well.

Thank You,
Alex